package com.zc.framework.shiro.cas;

import org.apache.commons.codec.DecoderException;
import org.apache.commons.codec.binary.Base64;
import org.apache.commons.codec.binary.Hex;
import org.apache.commons.lang3.StringEscapeUtils;

import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;

/**
 * Created by zc on 2016/8/30.
 * 封装各种格式的编码解码工具类.
 * 1.Commons-Codec的 hex/base64 编码
 * 2.自制的base62 编码
 * 3.Commons-Lang的xml/html escape
 * 4.JDK提供的URLEncoder
 */
public class Encodes {
        private static final String DEFAULT_URL_ENCODING = "UTF-8";
        private static final char[] BASE62 = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz".toCharArray();

        /**
         * Hex编码.
         */
        public static String encodeHex(byte[] input) {
            return Hex.encodeHexString(input);
        }

        /**
         * Hex解码.
         */
        public static byte[] decodeHex(String input) {
            try {
                return Hex.decodeHex(input.toCharArray());
            } catch (DecoderException e) {
                throw Exceptions.unchecked(e);
            }
        }

        /**
         * Base64编码.
         */
        public static String encodeBase64(byte[] input) {
            return Base64.encodeBase64String(input);
        }

        /**
         * Base64编码, URL安全(将Base64中的URL非法字符'+'和'/'转为'-'和'_', 见RFC3548).
         */
        public static String encodeUrlSafeBase64(byte[] input) {
            return Base64.encodeBase64URLSafeString(input);
        }

        /**
         * Base64解码.
         */
        public static byte[] decodeBase64(String input) {
            return Base64.decodeBase64(input);
        }

        /**
         * Base62编码。
         */
        public static String encodeBase62(byte[] input) {
            char[] chars = new char[input.length];
            for (int i = 0; i < input.length; i++) {
                chars[i] = BASE62[((input[i] & 0xFF) % BASE62.length)];
            }
            return new String(chars);
        }

        /**
         * Html 转码.
         */
        public static String escapeHtml(String html) {
            return StringEscapeUtils.escapeHtml4(html);
        }

        /**
         * Html 解码.
         */
        public static String unescapeHtml(String htmlEscaped) {
            return StringEscapeUtils.unescapeHtml4(htmlEscaped);
        }

        /**
         * Xml 转码.
         */
        public static String escapeXml(String xml) {
            return StringEscapeUtils.escapeXml(xml);
        }

        /**
         * Xml 解码.
         */
        public static String unescapeXml(String xmlEscaped) {
            return StringEscapeUtils.unescapeXml(xmlEscaped);
        }

        /**
         * URL 编码, Encode默认为UTF-8.
         */
        public static String urlEncode(String part) {
            try {
                return URLEncoder.encode(part, DEFAULT_URL_ENCODING);
            } catch (UnsupportedEncodingException e) {
                throw Exceptions.unchecked(e);
            }
        }

        /**
         * URL 解码, Encode默认为UTF-8.
         */
        public static String urlDecode(String part) {

            try {
                return URLDecoder.decode(part, DEFAULT_URL_ENCODING);
            } catch (UnsupportedEncodingException e) {
                throw Exceptions.unchecked(e);
            }
        }
}
